Additional information

Only countries with data for virtually all of each period were included, the numbers of countries are given in parentheses. Regional percentages have been weighted by country population.

North: Norway, Sweden, Finland and Iceland. Central: Austria, Denmark, England and Wales, Scotland, the Netherlands, Germany, Switzerland, Luxembourg and Ireland. For Denmark no data have been reported to the joint questionnaire since 1998. However, according to the European Commission, Denmark has achieved 100 % compliance with secondary treatment and 88 % compliance with more stringent treatment requirements (with respect to load generated) under the UWWTD. This is not accounted for in the figure.South: Cyprus, Greece, France, Malta, Spain and Portugal (Greece only up to 1997 and then since 2007). East: Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Slovenia, Slovakia. South-east: Bulgaria, Romania and Turkey.

North: Norway, Sweden, Finland and Iceland. Central: Austria, Denmark, England and Wales, Scotland, the Netherlands, Germany, Switzerland, Luxembourg and Ireland. For Denmark no data have been reported to the joint questionnaire since 1998. However, according to the European Commission, Denmark has achieved 100 % compliance with secondary treatment and 88 % compliance with more stringent treatment requirements (with respect to load generated) under the UWWTD. This is not accounted for in the figure.South: Cyprus, Greece, France, Malta, Spain and Portugal (Greece only up to 1997 and then since 2007). East: Czech Republic, Estonia, Hungary, Latvia, Lithuania, Poland, Slovenia, Slovakia. South-east: Bulgaria, Romania and Turkey.